PortImport enables remote access of internal UDP and TCP ports. For example, if there is a server on a back-end LAN that cannot accept connections directly from the Internet, that server can run a component of PortImport that makes a connection outbound to an administration console elsewhere. The person at the administration console can then access the ports on the remote back-end machine and on other machines in the back-end LAN that are accessible from the first back-end machine.

Both IPv4 and IPv6 addresses are supported. Both the tunnel and the forwards are fault-tolerant, so you can stay connected during unstable times. Installation is optional.